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- Ryuzaburo Noda
- 1974

Finite groups with more than two pairwise inequivalent doubly transitive representations all with the same permutation character were studied originally by Wielandt and Ito. Recently Cameron [2] has… (More)

- Ryuzaburo Noda
- 1979

- Ryuzaburo Noda
- Graphs and Combinatorics
- 1986

AbstractIt is shown that ifA is an orthogonal array (N, n, q, 3) achieving Rao's bound, thenA is either(i)an orthogonal array (2n, n, 2, 3) withn ≡ 0 (mod 4), or(ii)an orthogonal array (q3,q + 2,q,… (More)

- Ryuzaburo Noda
- Eur. J. Comb.
- 1998

We give some inequalities for Steiner systems S(t,k,v) which improve the inequalityv? (t+ l)(k?t+l) and Fisher's inequalityv?t+l?(k?t+l)(k?t+2).

- Ryuzaburo Noda
- Graphs and Combinatorics
- 1991

The following theorem is proved.Theorem. An inequalityv ≧ (t + 1)(k −t + 1) + (k −t) holds for Steiner systemsS(t, k, v) witht < k < v andt even with equality if and only if (t, k, v) = (t, t + 1, 2t… (More)

- Ryuzaburo Noda
- 1972

- Ryuzaburo Noda
- 1976

- Ryuzaburo Noda
- 1985

On considere les graphes fortement reguliers qui peuvent se partager en deux sous graphes fortement reguliers avec un nombre egal de sommets

- Ryuzaburo Noda
- 1967